Grove - Alcohol Sensor

What is this?

Alcohol sensor is semiconductor sensor for alcohol detection. It has good sensitivity and fast response to alcohol, suitable for portable alcohol detector.


Status: Completed
Available as a part: Grove - Alcohol Sensor
Tags: sensor, grove, gas sensor, alcohol sensor


Grove - Alcohol Sensor is a complete alcohol sensor module for Arduino or Seeeduino. It is built with MQ303A semiconductor alcohol sensor. It has good sensitivity and fast response to alcohol. It is suitable for making Breathalyzer. This Grove implements all the necessary circuitry for MQ303A like power conditioning and heater power supply. This sensor outputs a voltage inversely proportional to the alcohol concentration in air.


  • Power requirements: 5 VDC @ ~120 mA (heater on)
  • Detection Gas: Alcohol
  • Concentration: 20-1000ppm Alcohol
  • Interface: 1 TTL compatible input (SEL), 1 TTL compatible output (DAT)
  • Dimension: 40×20×12mm
  • Heater Voltage: 0.9V ± 0.1V AC or DC
  • Heater Current: 120±20mA

Application Ideas

  • Alcohol level over-limit alarm
  • Stand-alone/background sensing device
  • Environmental monitoring equipment


  • Input Voltage: 5V
  • Working Current: 120mA
  • Detectable Concentration: 20-1000ppm
  • Grove Compatible connector
  • Highly sensitive to alcohol.
  • Fast response and resumes quickly after alcohol exposure.
  • Long life.
  • Compact form factor.

Hardware Installation

Plug the Grove - Alcohol Sensor onto the digital A0 on Grove - Base Shield, and then plug the base shield onto Arduino;


  • Alcohol sensor is very sensitive semiconductor device. Handle with care.
  • Do not expose to organic silicon steam, alkali or corrosive gases.
  • Do not use freeze or spill water.
  • Maintain proper working voltage.

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